This allows Hydra to use binaries from available binary caches. It makes the queue monitor thread quite a bit slower, so if you don't want to use binary caches, it's better to add "--option build-use-substitutes false" to the hydra-queue-runner invocation. Fixed #243.
To start hacking on Hydra, run:
$ ./dev-shell
$ ./configure $configureFlags --prefix=/opt/hydra
$ make
$ make install
Or, if you just want to build from source (on x86_64-linux):
$ nix-build -A build.x86_64-linux release.nix
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